Which one of the following is nearly monochromatic light ?
Correct answer: C. light form sodium lamp
- A. light form fluorescent tube
- B. light form neon lamp
- C. light form sodium lamp
- D. light form simple lamp
Explanation
A sodium lamp emits light mainly at closely spaced yellow spectral lines, so it is treated as nearly monochromatic. Option b may be selected because a neon lamp also has a characteristic colour, but neon produces several spectral lines and is less nearly monochromatic.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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